POWER PLANT:FUEL GAS PIPELINE & METERING STATION

POWER PLANT

 FUEL GAS PIPELINE & METERING STATION

DESCRIPTION OF WORK
       GENERAL
            A brief description of the Scope of Work is given hereunder:

PIPELINE

 The pipeline shall have minimum one (1) meter cover over its top. A minimum half (1/2) meter berm shall be provided over the pipeline in addition to one (1) meter cover, and shall be stabilized with suitable material, to prevent wind and/or rain erosion.

    Gas operated sectionalizing valve(s) shall be provided.

    Evaporation pond and burn pits/flare system, to dispose of the process liquid waste and the vent gases shall be provided.

The pipeline shall be cathodically protected through the impressive current system.

 The insulating flanges shall be provided at both ends of the underground pipeline where it is connected with the above-ground piping.
    he underground piping shall be properly coated and wrapped, whereas aboveground piping shall be painted 

       METERING STATION

    The fully automatic metering station capable of handling gas requirement  extensions, with the required accuracy as:

a]         Fuel gas custody metering station consisting of a skid having four (4) metering streams with two (2) working, one (1) standby stream and one metering stream for start-up purposes along with a flow computer panel and all other associated equipment and facilities

b]         Emergency shut down (ESD) system consisting of a safety shut-off valve and local shutdown cabinet, complete with instrumentation & control system, on the main incoming line

c]         Gas separators/filters complete with all accessories, instrumentation & controls

d]         Flow control facility, to allow and control gas flow  complete with all accessories,

 instrumentation & controls

 e]         Pressure reducing station, to reduce incoming gas pressure with all accessories, instrumentation & controls

f]          Control and monitoring of the complete fuel gas supply and metering system locally through centralized

g]         Establishing of a communication link between the control system of custody transfer metering skid 

h]         Control building having a concrete structure to house all electrical and control equipment
i]          Power supply system complete in all respects

]           Lighting and grounding system

k]         HVAC system for the control building

l]          Fire detection and protection system complete in all respects

m]        Slop tank with pumps and associated facilities

n]         Burn pit/flare system with igniters

o]         Drainage system

p]         Nitrogen gas system consisting of nitrogen gas cylinders and distribution system for purging the line in case of any maintenance

q]         Portable gas detectors

r]          Associated civil works, security fencing of custody metering station and other facilities

s]         All other related and associated equipment and facilities

DESIGN PARAMETERS

.The design of the facility shall be state of art and shall provide the maximum levels of reliability and availability, the convenience of operation and maintenance, neat and orderly arrangement, which shall take into account the functional requirements of the various systems of the metering station.

    The guidelines mentioned herein are to be understood as general and as minimum requirements along with any other guidelines, even though not specifically mentioned shall be followed in order to ensure safe, reliable, proper, and continuous commercial operation of the complete installation.

       Contamination Sources

    The Contractor shall ensure that drainage of oily water and other hydrocarbons shall not be drained in an open area/surface.

 Provisions shall be made to collect all drains in the slop tank for pumping
    The Contractor shall ensure that the water used for flushing of the pipeline shall be collected in temporary ponds.

During the scraping operation, the Contractor shall make necessary arrangements to collect the waste and dispose of it according to the Saudi Aramco standards.

    No gas shall be allowed to vent into the atmosphere except for the safety valves. All vents shall be disposed of through the burn pit/flare system

Standardization and Interchangeability

a]         The equipment supplied shall be designed to facilitate inspection, maintenance, and repair. Operational excellence and lowest maintenance requirements are of prime concern. The design shall incorporate every reasonable precaution and provision for the safety of those involved in the operation and maintenance of the facility.

b]         The equipment shall be standardized as far as possible and the corresponding parts throughout shall be made interchangeable wherever possible.

c]         All equipment performing similar duties shall be, as far as applicable, of the same type, make for the entire facility in order to limit the stock of spare parts required, and maintain uniformity of equipment to be installed

            The scope comprises design, supply, installation, testing and commissioning of a Fuel Gas Pipeline and Fuel Gas Transfer Custody Metering Skid to handle fuel gas requirements when all the units are running at base load at a minimum ambient temperature with 100 % extra capacity for future